Immunohistologic analysis of renal CD40 and CD40L expression in lupus nephritis and other glomerulonephritides

Arthritis and Rheumatism
M J YellinL Chess

Abstract

To investigate potential mechanisms by which CD40L-mediated signals may be involved in the pathogenesis of lupus glomerulonephritis (GN). Renal in situ CD40L and CD40 expression was examined in patient biopsy specimens. Immunohistochemical studies were performed on frozen sections utilizing anti-CD40L monoclonal antibody (MAb), anti-CD40 MAb, or control MAb. As controls, we analyzed normal kidney specimens and specimens obtained from patients with IgA nephropathy, focal segmental glomerulosclerosis, minimal change disease, idiopathic membranous GN, and antineutrophil cytoplasmic antibody-positive pauci-immune GN. Staining distribution was noted and staining intensity scored on a semiquantitative scale of 0 (no staining) to 3+ (intense staining). In normal kidney, CD40 was expressed on parietal epithelial cells, mesangial cells, endothelial cells, and distal tubules but not proximal tubules. Glomerular and tubular CD40 expression was markedly up-regulated in class III and class IV lupus GN, where there was intense staining of crescents, proximal and distal tubules, and interstitial mononuclear cells. In contrast, CD40 expression in class V lupus GN was similar to that in normal kidney. Interstitial mononuclear cells expressing C...Continue Reading

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